METHOD FOR DETERMING THE SIZE DISTRIBUTION OF MAGNETIC PARTICLES IN MAGNETIC DISPERSION

摘要

The invention relates to a method for determining the magnetic particle size distribution in magnetic disperse system, comprising: measuring of magnetization of magnetic disperse system vs intensity of magnetic field curve M0(H) at the reference temperature T0; the correction of the magnetization against parasitic processes up to the first order using the relation where is the effective paramagnetic susceptibility; and determining the particle size distribution by regularization method. The present method is characterized in that:- in addition, at least one magnetization of magnetic disperse system vs intensity of magnetic field curve Mi(H) is measured at a temperature Ti, wherein the difference between T0 and Ti is at least 5 K,- the correction of the magnetization of magnetic disperse system vs intensity of magnetic field curve M0(H) at the reference temperature T0 is performed with due regard to the mutual magnetic interaction of individual particles in a local field approximation with the substitution of argument where λ is a local field parameter, which is determined by the regression of a data array {Xi,Yi}, Xi and Yi are parameters of the magnetization curves at the temperature Ti, with a linear functionwhere a is the second scalar parameter of the regression;- whereupon the particle size distribution is determined by a regularization method.